/**
 * (C) Copyright IBM Corp. 2010, 2015
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 */

package com.ibm.bi.dml.yarn;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.yarn.client.api.AMRMClient;
import org.apache.hadoop.yarn.client.api.AMRMClient.ContainerRequest;

public class DMLAppMasterStatusReporter extends Thread
{
	
	public static long DEFAULT_REPORT_INTERVAL = 5000;
	private static final Log LOG = LogFactory.getLog(DMLAppMasterStatusReporter.class);
	
	
	private AMRMClient<ContainerRequest> _rmClient;
	private long _interval; //in ms
	private boolean _stop;	
	
	
	public DMLAppMasterStatusReporter(AMRMClient<ContainerRequest> rmClient, long interval) 
	{
		_rmClient = rmClient;
		_interval = interval;
		_stop = false;
	}
	
	public void stopStatusReporter()
	{
		_stop = true;
	}
	
	@Override
	public void run() 
	{
		while( !_stop ) 
		{
			try
			{
				//report status (serves as heatbeat to RM)
				_rmClient.allocate(0);

				//sleep for interval ms until next report
				Thread.sleep( _interval );
			}
			catch(Exception ex)
			{
				LOG.error("Failed to report status to ResourceManager.", ex);
			}
		}
	}
}
